DateView.java

/*
 * Copyright (C) 2014 AChep@xda <artemchep@gmail.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA  02110-1301, USA.
 */
package com.achep.acdisplay.ui.widgets;

import android.annotation.SuppressLint;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.text.format.DateFormat;
import android.util.AttributeSet;
import android.widget.TextView;

import com.achep.acdisplay.R;
import com.achep.base.Device;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;

public class DateView extends TextView {
    private static final String TAG = "DateView";

    private final Date mCurrentTime = new Date();

    private SimpleDateFormat mDateFormat;
    private String mLastText;

    private BroadcastReceiver mIntentReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            final String action = intent.getAction();
            if (Intent.ACTION_TIME_TICK.equals(action)
                    || Intent.ACTION_TIME_CHANGED.equals(action)
                    || Intent.ACTION_TIMEZONE_CHANGED.equals(action)
                    || Intent.ACTION_LOCALE_CHANGED.equals(action)) {
                if (Intent.ACTION_LOCALE_CHANGED.equals(action)
                        || Intent.ACTION_TIMEZONE_CHANGED.equals(action)) {
                    // need to get a fresh date format
                    mDateFormat = null;
                }
                updateClock();
            }
        }
    };

    public DateView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    protected void onAttachedToWindow() {
        super.onAttachedToWindow();

        IntentFilter filter = new IntentFilter();
        filter.addAction(Intent.ACTION_TIME_TICK);
        filter.addAction(Intent.ACTION_TIME_CHANGED);
        filter.addAction(Intent.ACTION_TIMEZONE_CHANGED);
        filter.addAction(Intent.ACTION_LOCALE_CHANGED);
        getContext().registerReceiver(mIntentReceiver, filter, null, null);

        updateClock();
    }

    @Override
    protected void onDetachedFromWindow() {
        super.onDetachedFromWindow();

        mDateFormat = null; // reload the locale next time
        getContext().unregisterReceiver(mIntentReceiver);
    }

    protected void updateClock() {
        if (mDateFormat == null) {
            final String dateFormat = getContext().getString(R.string.status_date_format);
            mDateFormat = getBestDateTimePattern(dateFormat);
        }

        mCurrentTime.setTime(System.currentTimeMillis());

        final String text = mDateFormat.format(mCurrentTime);
        if (!text.equals(mLastText)) {
            setText(text);
            mLastText = text;
        }
    }

    @SuppressLint("NewApi")
    private SimpleDateFormat getBestDateTimePattern(String dateFormat) {
        if (Device.hasJellyBeanMR2Api()) {
            final Locale l = Locale.getDefault();
            final String fmt = DateFormat.getBestDateTimePattern(l, dateFormat);
            return new SimpleDateFormat(fmt, l);
        } else {
            return new SimpleDateFormat(dateFormat);
        }
    }
}